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NDT Advance Access published online on October 4, 2005
Nephrology Dialysis Transplantation, doi:10.1093/ndt/gfi127
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© The Author [2005]. Published by Oxford University Press on behalf of ERA-EDTA. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received March 18, 2004
Accepted August 12, 2005

Original Articles

Iron chelators do not reduce cold-induced cell injury in the isolated perfused rat kidney model

Miranda Bartels-Stringer 1, Jack F. M. Wetzels 2, Alfons C. Wouterse 1, Eric Steenbergen 3, Frans G. M. Russel 1, and Cornelis Kramers 1*

1 Department of Pharmacology--Toxicology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
2 Department of Nephrology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
3 Department of Pathology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands

* To whom correspondence should be addressed.
Cornelis Kramers, E-mail: C.Kramers{at}pharmtox.umcn.nl



  Abstract

Background. In vitro, cold-induced injury is an important contributor to renal tubular cell damage. It is mediated by iron-dependent formation of reactive oxygen species and can be prevented by iron chelation. We studied whether iron chelators can prevent cold-induced damage in the isolated perfused rat kidney (IPK) model both after cold perfusion (CP) and after cold storage (CS). We hypothesized that in the CP model iron-dependent cold-induced injury is more pronounced, since oxygen is constantly provided.

Methods. The IPK was either flushed with University of Wisconsin (UW) solution and stored for 4, 18 or 24 h at 4°C or perfused during 4 h at 4°C with UW for machine perfusion. The iron chelators 2,2'-dipyridyl or desferal, or the negative control 4,4'-dipyridyl were added during the cold perfusion. Kidney function was measured during 2 h reperfusion at 37.5°C and compared to a control group (without cold preservation).

Results. Compared to control perfusion, kidney function was decreased in all experimental protocols. glomerular filtration rate and FR(H2O) were significantly decreased, while FE(gluc) and FE(Na) were higher after 4 h CS and CP. After 4 h CP, also renal vascular resistance was increased. Addition of 2,2'-dipyridyl did not improve kidney function after either CS or CP. Prolonged periods of CS worsened kidney function. The addition of 2,2'-dipyridyl or desferal did not improve kidney function after longer periods of CS.

Conclusions. Addition of an iron chelator to the preservation solution UW did not improve kidney function after both CS and CP. Iron chelation is not able to prevent cold-induced damage in the isolated perfused rat kidney.

Keywords: cold perfusion; cold storage; iron; isolated perfused kidney; renal injury.
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